data = [
    [180.90, 88],
    [10.25, 65],
    [56.14, 90],
    [104.65, 90],
    [100.30, 88],
    [297.15, 50],
    [26.75, 65],
    [130.62, 50],
    [240.28, 58],
    [270.62, 80],
    [115.87, 88],
    [247.34, 95],
    [73.21, 90],
    [101.00, 50],
    [79.54, 50],
    [278.44, 70],
    [199.26, 50],
    [12.97, 90],
    [166.30, 78],
    [125.50, 58],
    [84.98, 90],
    [113.35, 68],
    [166.57, 50],
    [42.56, 90],
    [81.90, 95],
    [131.78, 80],
    [255.89, 78],
    [109.17, 90],
    [146.69, 68],
    [139.33, 65],
    [141.16, 78],
    [154.74, 80],
    [59.42, 80],
    [85.44, 68],
    [293.70, 88],
    [261.79, 65],
    [11.30, 88],
    [268.27, 58],
    [128.29, 88],
    [251.03, 80],
    [208.39, 75],
    [128.88, 75],
    [62.06, 90],
    [225.87, 75],
    [12.89, 75],
    [34.28, 75],
    [62.16, 58],
    [129.12, 50],
    [218.37, 50],
    [289.69, 80],
]

if __name__ == '__main__':
    ans = 0
    for item in data:
        ans += item[0] * item[1] * 0.01
    print(ans)
